Nitrogenous and carbonaceous aerosols in PM_(2.5) and TSP during pre-monsoon:Characteristics and sources in the highly polluted mountain valley

作     者：Hemraj Bhattarai Lekhendra Tripathee Shichang Kang Pengfei Chen Chhatra Mani Sharma Kirpa Ram Junming Guo Maheswar Rupakheti Hemraj Bhattarai;Lekhendra Tripathee;Shichang Kang;Pengfei Chen;Chhatra Mani Sharma;Kirpa Ram;Junming Guo;Maheswar Rupakheti

作者机构：Earth System Science Programme and Graduate Division of Earth and Atmospheric SciencesThe Chinese University of Hong KongHong KongChina State Key Laboratory of Cryospheric ScienceNorthwest Institute of Eco-environment and ResourcesChinese Academy of Sciences(CAS)Lanzhou 730000China Key Laboratory of Tibetan Environment Changes and Land Surface ProcessesInstitute of Tibetan Plateau ResearchCASBeijing 100101China CAS Center for Excellence in Tibetan Plateau Earth SciencesBeijing 100085China Himalayan Environment Research Institute(HERI)Kathmandu 44602Nepal Central Department of Environmental SciencesTribhuvan UniversityKathmandu 44613Nepal Institute of Environment and Sustainable DevelopmentBanaras Hindu UniversityVaranasi 221005India Institute for Advanced Sustainability StudiesPotsdam 14467Germany 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2022年第34卷第5期

页      面：10-24页

核心收录：

学科分类：07[理学] 070602[理学-大气物理学与大气环境] 0706[理学-大气科学] 

基　　金：supported by the Strategic Priority Research Program of Chinese Academy of Sciences,Pan-Third Pole Environment Study for a Green Silk Road (Pan-TPE)(No.XDA20040501) the National Natural Science Foundation of China (Nos.41705132,41675130) the State Key Laboratory of Cryospheric Science (No.SKLCS-ZZ-2020) the grant received from the AsiaPacific Network for Global Change Research (APN)(Project referenceCRECS2020-07MY-Tripathee) Chinese Academy of Science for international Young staff support under the PIFI(2020FYC0001) program part of the framework across the TPAtmospheric Pollution and Cryospheric Change(APCC) HKSAR governmentfor providing Belt&Road scholarship the Research Grants Council (RGC) of Hong Kong for providing Hong Kong PhD Fellowship Scheme (HKPFS),2020/21 (No.PF19-33279) support from the Institute for Advanced Sustainability Studies (IASS),which is funded by the German Federal Ministry for Education and Research (BMBF)and the Brandenburg State Ministry for Science,Research and Culture (MWFK) 

主　　题：Nitrogenous aerosol Carbonaceous aerosols Major ions Particulate pollution Kathmandu Valley(KV) 

摘      要：This study reports for the first time a comprehensive analysis of nitrogenous and carbona-ceous aerosols in simultaneously collected PM_(2.5) and TSP during pre-monsoon(March-May 2018)from a highly polluted urban Kathmandu Valley(KV)of the Himalayan *** mean mass concentration of PM_(2.5)(129.8 μg/m^(3))was only-25%of TSP mass(558.7 μg/m^(3))indicating the dominance of coarser mode ***,the mean concentration as well as fractional contributions of water-soluble total nitrogen(WSTN)and carbonaceous species reveal their predominance in find-mode *** mean mass concentration of WSTN was 17.43±4.70 μg/m^(3)(14%)in PM_(2.5) and 24.64±8.07 μg/m^(3)(5%)in ***,the fractional contribution of total carbonaceous aerosols(TCA)is much higher in PM_(2.5)(~34%)than that in TSP(~20%).The relatively low OC/EC ratio in PM_(2.5)(3.03±1.47)and TSP(4.64±1.73)suggests fossil fuel combustion as the major sources of carbonaceous aerosols with contributions from secondary organic ***-day air mass back trajectories sim-ulated with the HYSPLIT model,together with MODIS fire counts indicate the influence of local emissions as well as transported pollutants from the Indo-Gangetic Plain region to the south of the Himalayan *** component analysis(PCA)also suggests a mixed contribution from other local anthropogenic,biomass burning,and crustal *** re-sults highlight that it is necessary to control local emissions as well as regional transport while designing mitigation measures to reduce the KV s air pollution.